Bond length alternation in unsymmetrical cyanine dyes and its influence on the vibrational structure of their electronic absorption spectra† / Heinz Mustroph in COLORATION TECHNOLOGY, Vol. 133, N° 6 (12/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 6 (12/2017) . - p. 469-475 Titre : Bond length alternation in unsymmetrical cyanine dyes and its influence on the vibrational structure of their electronic absorption spectra† Type de document : texte imprimé Auteurs : Heinz Mustroph, Auteur ; Knut Reiner, Auteur ; Bianca Senns, Auteur Année de publication : 2017 Article en page(s) : p. 469-475 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Colorants -- Analyse Cyanines Les cyanines sont le nom non systématique d'une famille de marqueurs synthétiques appartenant au groupe des polyméthines. Les cyanines ont de nombreuses utilisations comme marqueurs fluorescents, particulièrement en imagerie biomédicale. Selon la structure, elles couvrent un spectre allant de l'IR à l'UV. Spectres d'absorption Index. décimale : 667.3 Teinture et impression des tissus Résumé : Based on the assumption that the unsymmetrical cyanine dyes can be regarded as a hybrid of the two corresponding symmetrical dyes it was expected that ?max of the unsymmetrical dye would be the arithmetic mean of ?max of the two symmetrical dyes. There is, however, often a remarkable difference between the arithmetic mean and the observed ?max of the unsymmetrical dye – the Brooker deviation. To date, this effect is explained in terms of increasing electronic energy differences. With increasing difference of the electronic structure between the ground and excited state, the difference between equilibrium geometry of ground and excited state increases and the relative intensity of the higher vibronic transitions 0–v increases and that of the 0–0 transition decreases. ?max represents the intensity maximum of an absorption band and could be related to the 0–0, 0–1 or another vibronic transition. We discuss the origin of the Brooker deviation on the vibrational structure of the spectra. Note de contenu : - Stationary electronic absorption spectra - The origin of vibrational structure in electronic absorption spectra DOI : 10.1111/cote.12303 En ligne : https://drive.google.com/file/d/13MxemrgVtdrVJqNmN64S4M3BfbdPUS-S/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29493 [article]

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